.container{
    width: 360px;
    margin: 20px auto;
    padding: 20px;
    background: #efefef;
    text-align: center;
    max-width: 600px;
}

#btn{
    width: 200px;
    height: 40px;
    line-height: 40px;
    margin: 10px auto;
    background: rgb(243, 81, 81);
    color: white;
    font-size: 24px;
    font-weight: bold;
    border-radius: 15px;
    user-select: none;
    cursor: pointer;
}

p{
    margin: 30px 0px;
}

#result{
    font-size: 18px;
    font-weight: bold;
}

.title{
    font-size: 20px;
    font-weight: semi-bold;
    margin: 20px 0px;
}

.his_t{
    font-size: 20px;
    font-weight: semi-bold;
    margin: 20px 0px;
}

.his_c{
    font-size: 16px;
    font-weight: semi-bold;
    margin: 20px 0px;
    color: rgb(243, 81, 81);
    cursor: pointer;
}

.description {
    text-align: left;
    margin-bottom: 20px;
    line-height: 1.6;
}

#info-btn {
    margin-bottom: 20px;
    padding: 10px 20px;
    font-size: 16px;
    cursor: pointer;
}

.popup {
    display: none;
    position: fixed;
    z-index: 1;
    left: 0;
    top: 0;
    width: 100%;
    height: 100%;
    overflow: auto;
    background-color: rgb(0,0,0);
    background-color: rgba(0,0,0,0.4);
}

.popup-content {
    background-color: #fefefe;
    margin: 15% auto;
    padding: 20px;
    border: 1px solid #888;
    width: 80%;
    max-width: 600px;
}

.close-btn {
    color: #aaa;
    float: right;
    font-size: 28px;
    font-weight: bold;
}

.close-btn:hover,
.close-btn:focus {
    color: black;
    text-decoration: none;
    cursor: pointer;
}

input[type="number"] {
    width: calc(50% - 10px);
    padding: 10px;
    margin: 10px 5px;
    font-size: 16px;
    border: 1px solid #ccc;
    border-radius: 5px;
    box-shadow: inset 0 1px 3px rgba(0, 0, 0, 0.1);
    transition: border-color 0.3s, box-shadow 0.3s;
}

input[type="number"]:focus {
    border-color: #f35151;
    box-shadow: 0 0 8px rgba(243, 81, 81, 0.3);
    outline: none;
}